﻿using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;
using WFramework.Common;

namespace SpeadFrm.Common
{
    #region AES 加密、解密
    public class AES
    {


        //默认密钥向量
        //private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
        private static readonly byte[] Keys = { 0x41, 0x72, 0x65, 0x79, 0x6F, 0x75, 0x6D, 0x79, 0x53, 0x6E, 0x6F, 0x77, 0x6D, 0x61, 0x6E, 0x3F };
        /// <summary>
        /// DES加密字符串
        /// </summary>
        /// <param name="encryptString">待加密的字符串</param>
        /// <param name="encryptKey">加密密钥,要求为8位</param>
        /// <returns>加密成功返回加密后的字符串,失败返回源串</returns>
        //		public static string Encode(string encryptString, string encryptKey)
        //		{
        //			encryptKey = Utils.GetSubString(encryptKey, 8, "");
        //			encryptKey = encryptKey.PadRight(8, ' ');
        //			byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
        //			byte[] rgbIV = Keys;
        //			byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
        //			DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
        //			MemoryStream mStream = new MemoryStream();
        //			CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
        //			cStream.Write(inputByteArray, 0, inputByteArray.Length);
        //			cStream.FlushFinalBlock();
        //			return Convert.ToBase64String(mStream.ToArray());
        //
        //		}

        public static string Encode(string encryptString, string encryptKey)
        {
            encryptKey = Utils.GetSubString(encryptKey, 32, "");
            encryptKey = encryptKey.PadRight(32, ' ');

            var rijndaelProvider = new RijndaelManaged { Key = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 32)), IV = Keys };
            var rijndaelEncrypt = rijndaelProvider.CreateEncryptor();

            var inputData = Encoding.UTF8.GetBytes(encryptString);
            var encryptedData = rijndaelEncrypt.TransformFinalBlock(inputData, 0, inputData.Length);

            return Convert.ToBase64String(encryptedData);
        }

        public static string Decode(string decryptString, string decryptKey)
        {
            try
            {
                decryptKey = Utils.GetSubString(decryptKey, 32, "");
                decryptKey = decryptKey.PadRight(32, ' ');

                var rijndaelProvider = new RijndaelManaged { Key = Encoding.UTF8.GetBytes(decryptKey), IV = Keys };
                var rijndaelDecrypt = rijndaelProvider.CreateDecryptor();

                var inputData = Convert.FromBase64String(decryptString);
                var decryptedData = rijndaelDecrypt.TransformFinalBlock(inputData, 0, inputData.Length);

                return Encoding.UTF8.GetString(decryptedData);
            }
            catch
            {
                return "";
            }

        }

    }

    #endregion

    #region DES 加密、解密
    public class DES
    {


        //默认密钥向量
        private static readonly byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };


        /// <summary>
        /// DES加密字符串
        /// </summary>
        /// <param name="encryptString">待加密的字符串</param>
        /// <param name="encryptKey">加密密钥,要求为8位</param>
        /// <returns>加密成功返回加密后的字符串,失败返回源串</returns>
        public static string Encode(string encryptString, string encryptKey)
        {
            encryptKey = Utils.GetSubString(encryptKey, 8, "");
            encryptKey = encryptKey.PadRight(8, ' ');
            var rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
            var rgbIV = Keys;
            var inputByteArray = Encoding.UTF8.GetBytes(encryptString);
            var dCSP = new DESCryptoServiceProvider();
            var mStream = new MemoryStream();
            var cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
            cStream.Write(inputByteArray, 0, inputByteArray.Length);
            cStream.FlushFinalBlock();
            return Convert.ToBase64String(mStream.ToArray());

        }

        /// <summary>
        /// DES解密字符串
        /// </summary>
        /// <param name="decryptString">待解密的字符串</param>
        /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
        /// <returns>解密成功返回解密后的字符串,失败返源串</returns>
        public static string Decode(string decryptString, string decryptKey)
        {
            try
            {
                decryptKey = Utils.GetSubString(decryptKey, 8, "");
                decryptKey = decryptKey.PadRight(8, ' ');
                byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Convert.FromBase64String(decryptString);
                var dcsp = new DESCryptoServiceProvider();

                var mStream = new MemoryStream();
                var cStream = new CryptoStream(mStream, dcsp.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch
            {
                return "";
            }

        }
    }

    #endregion

    #region LKDES 用于接口的 DES加密、解密
    public class LKDES
    {
        /// <summary>
        /// DES加密
        /// </summary>
        /// <param name="strInput">明文</param>
        /// <param name="strKey">密钥，只支持8位密钥</param>
        /// <returns>返回密文</returns>
        public static string Encode(string strInput, string strKey)
        {
            byte[] bStrInput = Encoding.Default.GetBytes(strInput);
            byte[] bKey = Encoding.ASCII.GetBytes(strKey);
            var des = new DESCryptoServiceProvider { Mode = CipherMode.ECB, Key = bKey, IV = new byte[8] };
            byte[] resultBytes = des.CreateEncryptor().TransformFinalBlock(bStrInput, 0, bStrInput.Length);
            return Convert.ToBase64String(resultBytes);
        }
        /// <summary>
        /// DES解密
        /// </summary>
        /// <param name="strInput">密文</param>
        /// <param name="strKey">密钥，只支持8位密钥</param>
        /// <returns>返回明文</returns>
        public static string Decode(string strInput, string strKey)
        {
            byte[] bStrInput = Convert.FromBase64String(strInput);
            byte[] bKey = Encoding.ASCII.GetBytes(strKey);
            var des = new DESCryptoServiceProvider { Mode = CipherMode.ECB, Key = bKey, IV = new byte[8] };
            byte[] resultBytes = des.CreateDecryptor().TransformFinalBlock(bStrInput, 0, bStrInput.Length);
            return Encoding.Default.GetString(resultBytes);
        }
    }
    #endregion
}